Deeper understanding of scanners from the scanner (top)

In the past two years, high-end flatbed scanner manufacturers have shifted their research focus to relatively new and higher-level scanning technologies called xy scanning technology. We know that the quality of the scanned image of the scanner depends on its dynamic scanning range (shadow details), bits (hierarchy) and resolution. The xy scanning technology is a new technology developed to solve people's resolution requirements on the scanner.
1. C-550 Lanovia xy scanner C-550 The Lanovia scanner is an xy platform scanner manufactured by Fuji Electric. The scanner has a bit depth of 48bit and a scan format of A3+. It uses 8000 pixels of three-color linear CCD and optical resolution. 5000dpi, interpolation resolution up to 10000dpi, and with X, Y axis zoom scan function. The position of the scanning head is controlled by the triple screw, and the scanning head can move in the vertical and horizontal (X, Y axis) within the scanning area, so that each document can be scanned at the optimal resolution. The zoom technology uses the entire width of the CCD to focus on the document, so each document can be scanned at the optimum resolution regardless of its size or position on the document table. The scanner has a flat pressure type, fixed and fixed original table, the maximum scanning area of ​​470 × 350mm, can accommodate up to 100 35mm transmission film at a time.
The flat-press manuscript table with mobile scanning head design can handle oversized originals and irregular three-dimensional objects. At the same time, the auto-focus function enables the machine to scan mounted originals. It can also scan a variety of originals, including continuous Adjust prints, linework, and color separations. With a dedicated slide holder, users can set multiple originals in advance to speed up the time for rewriting. Each frame is accompanied by a number to facilitate the software to automatically identify when scanning. Its driver software is C-Scan. Its operation interface and color technology are similar to Fujifilm's other high-end roller scanners. It has a background operation function and can scan the scanned preview image on the screen while scanning the scanner. Other originals.
This kind of image editing is parallel to scanning, and it can perform batch scanning and working methods that are shown in a simplified diagram, which can save time and increase production efficiency. C-Scan not only has rich color editing capabilities, such as control level, color, sharpness (USM), and printing parameters, but also provides optimal adjustment of images, as well as descreening and line drawing processing functions, while using C-Dot. The software can also directly scan color separation pictures. Each original placed on any place on the platen can scan performance at the optimal resolution, and can handle oversized originals and irregular three-dimensional objects. What is the reason? Because xy scanning technology is used. Why does the xy scanning method have the performance that this non-xy scanner does not have? Below we illustrate the difference between non-xy scanners and xy scanners.
Second, the xy scanner's special xy scanning technology provides the ability to obtain the same resolution quality for images placed anywhere on the scan table. Its "flattening capability" (scanning the strips together) allows the flatbed scanner to be comparable to a roller scanner capable of high resolution scanning of too many documents. These capabilities of the platform scanner all result from the fact that its moving parts can move in both x (horizontal) and y (vertical) directions. Non-xy platform scanners that can only move in the x direction do not have this capability .
Strictly speaking, this is the imaging sensor of the xy scanner that can move in the xy direction at the same time. In fact, with the deepening of research and the principle of relativity of motion in physics, the currently studied xy scanners employ different methods to complete the relative movement of the imaging sensor in the xy plane. To further illustrate the unique features of the xy scanner, here are some basics.
1. Sensor and picture resolution. The scanner consists of many important components, the most important being the imaging sensor and the associated optical system. Drum scanners typically use optical telecommunication boosters (PMTs) as imaging sensors, while platform scanners use charge coupled device (CCD) technology. At present, the development of the scanner has been shifted to the CCD technology, so that currently manufactured platform scanners using a CCD as an imaging sensor have been used as drum scanners using photomultipliers both in optical resolution and in hierarchical reproduction. It is very close.
2. Optical resolution. We know that the optical resolution is determined by the scanner sensor system. This is because the light of the original carrying the original transmitted from the continuous original, the line original, the reflective or the transmissive original is received by the imaging sensor of the scanner, and the light with the original information is converted into an electric signal by the sensor and then passed through the digital-to-analog converter. Converted to digital data bits, we call it an element or pixel of the image.
So, whether it is a non-xy or xy scanner, the optical resolution of the scanner is essentially determined by its optical system, which is determined by the discrete sampling of the imaging sensors of each scanner. The optical resolution can be defined by the following formula:
Number of CCD elements/scanning width [y direction] (in) = optical resolution (to be continued)